Electrical apparatus



Sept. 23, 1952 J. w. JACOBS ELECTRICAL APPARATUS I 4 Sheets-Sheet 1 Filed April 6, 1950 INVEN TOR.

Sept. 23, 1952 J. w. JACOBS 2,611,275

ELECTRICAL APPARATUS Filed April 6, 1950 4 Sheets-Sheet 2 FIG.7

INVENTOR. 222 260 56.9 I mam? Sept. 23, 1952 J. w. JACOBS 2,611,275

ELECTRICAL APPARATUS 4 Sheets-Sheet 35 Filed April 6, 1950 Pie. N g

Z INVENTOR.

p 3, 1952 J. w. JACOBS 2,611,275

ELECTRICAL APPARATUS Filed April 6, 1950 I 4 Sheets-Sheet 4 IN VEN TOR.

3 member 54 is a connecting member 62 of some suitable electrical insulating material, such as a thermo-plastic or thermo-setting material. This member 62 has a narrow slot therein which engages the leaf spring 32 to operate the movable contact 34 to closed and open positions.

To cause the contact 34 to be operated with a snap-action in the opening and closing movement, there are provided a pair of rigid toggle members 64 and 66 having their inner ends pivotally connected through the use of knife edges and notches with the metal member 54 which is bonded to the lower face of the diaphragm structure 38. The cup-shaped housing structure 20 in its cylindrical portion has an in-' turned boss 68 provided with a notch to provide a pivotal connection with the knife .edge on the outer end of the toggle member 66. The opposite side of the cylindrical portion of the housing structure 20. has an extruded threaded aperture receiving an adjusting screwlnprovided with a rotatably mounted cap I2 on its inner end having a notch for providing a pivotal connection with the knife edge on the outer end of the toggle member 64. V

, The cup-shaped housing structure 20 is preferably'formed of a resilient metal, such as steel, preferably stainless steel or spring brass or copper. The toggle members 64 and 66 are column loaded by adjustment of the adjusting screw to the proper amount so that the cylindrical wall portions of the cup-shaped housing structure 20 are distorted slightly and form a cylindrical spring which serves as the toggle spring for the toggle members 64 and 66. The amount of distortion required of the housing to serve as a spring for the toggle members is quite small and does not disturb the accuracy of the control. If, however, it is desired to make the cup-shaped housing structure rigid the toggle members may be made with a C-shaped section, as shown by the toggle members I64 and I66 in Fig. 9. By placing the C-shaped section in these toggle members the toggle members are made resilient to include spring action and the housing structure may then be made rigid.

i 1 In Fig. 1, the cup-shaped housing structure 20 is rotatably supported by an L-shaped bracket ,i'l4ft'he lower end of which is fastened to a metal ,wall member I6. This L-shaped bracket is provided with a flanged aperture 18 which surrounds .and serves as a bearing for the extruded threaded aperture 52 of the housing structure 20, which is spun over the flanged aperture 18 of the bracket .14. I 7 v V By this construction, the switch may be properly set by adjustment of the sleeve 46 within the flanged aperture 52. The knob 50 may then be placed on the sleeve in the proper relationthe sleeve 46 in place. They L-shaped bracket I4 has an upturned projection I5 which cooperates with the downwardly extending projection 49 upon the knob to limit the knob to one revolution of movement. Any further'adjustments may be made by bodily rotating the entire housing structure consisting of the cup-shaped housing member 20 and the electrical insulating terminal supportmember 22 relative to the L-shaped bracket 4 14. An escutcheon plate 80 is provided to cover an opening in the wall member I6 through which access to the control is obtained. The rim of the knob 50 extends through an opening in the escutcheon plate 80 for finger manipulation to provide a limited temperature selection by the user.

In Figs. 4, 8 and 10 there is showna preferred form of'the invention. In this form there is also provided a resilient cup-shaped housing structure 220. Within the open end of this housing structure is a terminal supporting member 222 of electrical insulating material. This terminal supporting structure 222 is substanttially identical to the terminal supporting structure and assembly shown in Fig. 1. They are both fastened to their respective cup-shaped housing supports in a similar manner. This is better illustrated in Figs. 8 and 10. The electrical terminal supporting structure 222 is provided with opposite flanges 2I8 an'd 2I6 which include shoulders against which are lodged opposite notched portions on the rim of the cup-shaped housing structure 220. The terminal supporting structure 222 is'providecl on opposite sides with grooves or notches 2 I4 and2 I2 through which extend the tongues 2I0 and 208'provided upon the rim of the cup-shaped structure 220. These tongues 218 and 208 are bent over, as shown'in Figs. 8'and 10, to flrmlyhold'the shoulders 2I6 and 2 I8 in place against the notched rim of the cup-sha'ped-housing structure 220 to. firmly lock the terminal supporting structure 222'to the cup-shaped housing structure 220 to provide a complete closing housing for the operating parts of the control.

The terminal support 222 has molded in it the terminal members 224 and 226 extending completely through the structure from top to bot-'- tom. The lower ends of these terminals are threaded so that electrical conductors may be fastened thereto by suitable binding screws. To the upper end of the terminal 224 there is riveted a leaf spring member 232' which is similar to the member 32 in Fig. 1. At its free end it is provided with a contact 234 adapted to move into and out of contact with the contact 236 provided on top of the terminal member 226.

In Figs. 4 and 10 the actuating diaphragm structure. 238 has its..upper face fastened to a pm 242 provided withvpassages 243 connecting the interior of the diaphragm structure 238 with the capillary tube 244 which, after making a 210 degree turn passes outthrough an aperture in the wall .of the cup-shaped housing structure "226 so that it may be exposed to thetemperature which is desired to ,be used to control the operationof the contacts 234 and 236.1 Bonded tothe head of the pin 242a UH-shaped'member 245 which extends around thecapillary tube and the diaphragm structurej238 and has its lower arm holds the bushing 246 in proper axial position.

The pad 241 on the lower face of the diaphragm structure 238 is provided with a metal follower member '254 provided with projecting tongues 256 and 258 which are struck out from-themain me 's tv e v-. hw .7 cup-sha ed ousing 'strfiet he (42 101s provided with ah ihwa' "1 F ""erhii'hos 268 an eitfiide'd'thi'eetded I U wall portio'fi of the tructure his"sbrew"-2j0 is provided witheh" inner pair 212 i'othtably mouhtedthefe vide "a; pivotal I the outer edge of the to scie'w 270 is adjusted s "as t zip mg tab the toggler'r'ferhheis U the contacts 234 and 236 W115]. move" closed positions accor'dihg to the makth'etchp sh 9 I64 and l 68, "ho'w n-Tn 9 ighayjhe for therigid toggle member zs "ages; The fientrol' THE-S b g by mining the ezztfhhllikthrhfihl the proper point to give the desired r between the pre'sshr'e withih the Apt phra'gm street ""e' 23B and the-'op'ehfiig and'c sj= m wdf the c h aicts'zs'a the 2s Thekhob zm is thenmounted theredh-gi'n ship to the orientation 5: w I e. The knob 250 prow'des ehih ed 'ehi'perettiie'selection by the 'user. when thekhfob fifl 'i'sjrotated so that the hollow sei'ew 2431s txirnedffto its outermost position, the yoke 24'5 eh'geges the pad 241 110 positively h'oldthe 'ebntectuZM-ih its open position. Farther 'adjiz'stme ofthe conitrol may he made hybodily rate me the-how's m structure 220 "relative to its inotih'tihg'mer'n' her 214 which is provided with-"efithge dj a "1-- time 218 forming a :b'e'arihg 's urf'o'i zhdi h g the threaded flanged aperture 252 of the cup-shaialed housingmember i220. The iho'unfting i'zihfhber 274 is provided with a; 'seff-sofew 215- ha forrholdinghthe bup=sha1ped ihoiisifiig in any desiredaposit'ion "of rotation. Th

mg member is fastened overa'h"-;pertiire ih the supporting wall 216' to support the eofit'rh meumea wfthi-h the when-that: thee-a r shed t'efieou'sly ad ust both "the'oia'eh an c osed p erconnection with th d'ihphmig hq Qietd" If desired, theto'g gle 'rhembers fil ahd rea mhy'h substituted for the tbggle members 3fiktmd 3%. The 'outr-ehii of the tog'gle mez'hhef 264 iv-'- otany cohhected to in-turned boss 3 68 pro vided in the cylindrical wan 'por'tionofth "u e shaped housing structure 320. The pivotal "-co'frhection is made through a hoteh 'in"the l ioss 369 and the .knife edge on the 'euternd oft-he "tog'gl'e member 364-; The outer end of the 'tqgg efhqezfi ber 3 66 is--pivota11y connected through" a kn'ife edge and'hotch'with acap membe'rfi btat hhly moufited upon the inner enaj-of the diusfh ing -'scr'ew ;310-he1d within the thrsmdflnngm aperture in the cylindrical wall portion 'f th'e Cup-shaped housing structure 32 0. f'l 3101s adjusted to appl -a columh i'oae 'othe toggle members 364 and 365 to cause the follower 3'5 '4tb=operate with a's'napactio'n. f;

1 The follo'wer member 354 is provifie'dw'ith a single projection 356 like the projeeitioh the shown in Fig, 6. This projection "op rates h'etween the shoulders of a double headed"scte'w 359 which is simila'tto the screw 1 59 h dahly housi g 'l Q T6. Z9I- hi e mina su p r member 322 is providedwith-an external groove 32!; into which projects a projection 323 projecting inwardly, from the cup-shaped housingstructure 320' to prevent relative rotation between the contact support 322 and the housing structure 320-. but permitting thecontact structure to he slid; in and out of the. housing structure 329. The terminal supporting member 322 is provided withethe terminahmembers 324 and 326 molded therein. The,terminal member 324 carries the leaf spring member 332 connected by the connecting member 362 of the electricalinsulat ing material withthe follower member 354 asin theother modification. The contact member 332 carries the movable contact 334 adapted to move into contact with the stationary contact 336 provided upon the inner end of the terminal member 326. 1 'In this modification the contact member 322 is provided with an annular notch which receives a g-shaped member 315 which-is rotatably mounted thereon. This C-shaped member 315 is fastened by screws to an annular adjusting knob 35!] which is internally threaded. The internal threads of the knob 359 thread upon the external threads 3|9 which are provided upon the rimflof the cup-shaped housing structure 320. When the knob 350 is rotated, the terminal supporting member 322 is bodily moved relative to the cup-shaped housing structure 329 and the actuating diaphragm structure 338 to adjust the operation of the movable contact 334 relative to the pressure within the actuating diaphragm structure 338. The mounting member 3I6: is mounted upon a wall 316 havin an aperture for receivingthe control. A cover 386 is provided for covering the terminals 324 and 326 and theelec trical connections and conductors, r

.In the form shown in Figs. 12 to 14, the terminal supporting member 422-is similar to that shown in'Fig. 6. The cup-shaped housing structure 420 however, is made in two parts which are bonded together. One part is in the form of a cylindrical member 4I9 provided with out-turned flanges 42l. Fastened to these flanges 42| by some form of bonding means is the secondpart inthe form of a thin metal disc 423 having a flanged threaded aperture which receives a threaded bushing 446., This threaded bushing 446 is-rotatably mounted upon the hollow sleeve 442. On the lower end-of this hollow sleeve 442 there is fastened an actuating diaphragm structure 438. The sleeve442- is provided with a capillary tube 444 which communicates with the interior of the actuating diaphragm structure 438. 5 The lower face of the diaphragm structure 438 is provided with a follower member 454 provided with a projection 456 extending in between the shoulders ofthe double headed screw 459 threaded into thetrminal support :422. The terminal support 422 has molded therein the terminal members 424 and426 to which the electrical conductors are attached; The leaf spring member 432 is riveted to the terminal 424 and is provided with a movable contact 434 which engages and disengages the'stationary contact 43=6on top of the terminal 426. i The follower member 454 is connected by the connecting member 462 with the leaf spring contact member 432 to actuate the movable contact 434 in accordance with the expansion and contraction-of the diaphragm structure 438 within the limits permitted by the projection 456.

In this modification there is provided a separateoresilient cylindrical ring 425 within the cupshaped housing memberv 420. Upon opposite sides this ring 425 are riveted the bearing members 421 and 429. The bearing member 421 is provided with a rotatable pin 468. The head of this pin-468 has apivotal connection with the outer end of the toggle member 466. The hear-- ing member 429 is internally threaded and carries therein an adjusting screw 43! which in turn receives a pin 412. The head of this pin 412 similarly has a pivotal connection with the outer end of the toggle member 464. The inner ends of the toggle members make pivotal connections with thefollower member 454 through the familiar knife edge and notched construction.

The bearing members 429, 421 extend through vertical elongated apertures 433, 435 in the cylindrical wall portions of the cup-shaped housing structure 420. The bearing members 421 and 429 are also guided by inclined slots in an adjusting knob. 458. The adjusting knob 450 is rotatably mounted upon the flange of the cup-shaped housing member 426 by a C-shaped ring 415. By this,

arrangement the cylindrical ring 425 maybe rotated to cam the bearing members 421 and 429 closely to or further away from the terminal support 422. This shifts the cylindrical ring 425 in a like manner to adjust the operation of the toggle members 464 and 466 in a manner to change the relationship between the '-pressure within the actuating diaphragm structure 438 and the operation of the movable contact 434. The toggle members 464 and 466 are. provided with a column loading by suitably-adjusting the screw 431 so as to slightly distort the cylindrical ring 425: The position of the actuating means proper may be adjusted by turning the externally threaded sleeve 436; The limits of movement may be adjusted by turning the double headed screw 459. The cup-shaped housing member 420 is fastened to the supporting wall 416 by the screw 411. The knob 450 projects through the aperture in the escutcheon plate 419.

A control of the type shown in any of the modifications disclosed herein may ,be made much smaller than the illustrations disclosed inthe drawings. The knife edge construction of the toggle members may bemade of hardened metal so that there is littlewear and friction is reduced thereby so that the controlmay be made very accurate, The parts are few in number and serve many functions so that the;control is simpleand' inexpensive. 1- i I 4 While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, as may come within the scope of the claims which follow.

What is claimed is as follows:-

1. A control arrangement including a support means, a control means and an actuating means operably connected together and mounted upon the support means, an adjusting screw threaded into the support means, said adjusting screw havmg a pair of spaced annular shoulders, said actuating means being provided with a projection extending in between saidspaced annular shoul-' ders for limiting the operation of the control means.

2. A controlarrangement including .a support means, a control means and an actuating means operably connected together and mounted upon the supportmeansan adjustingscrew threaded into the support means. said'adjusting screw havmg apair of spaced annular shoulders, s'aid actu atmg:meansbeingprovided with a projectio'n ex- J 9 j-tendinein be wen saidspaced annular shoulders for limiting the operation of the control means,

' andan adjusting means for adjusting the locationiofthe actuating means.

A control arrangement including a support means, acontrolmeans and an actuating means operably connected together and mounted upon means for, controlling the operation of the control means. i Y

A centr ar a en inclu a shaped structure, a'diaphragm means mounted in one end portion of the cup-shaped structure, a controlmeans mounted in the" other end-portionofthe cup-shaped structure, said diaphragm "means being operatively connected to said control means, a set of two toggle members each having their inner end portions pivotally connected to said actuating means, the opposite wall portions of said cup-shaped structure being provided with pivotal supports for pivotally supporting the outer ends of said toggle members, one of said pivotal supports including a threaded adjusting means threaded through the Wall of said cupshaped structure.

5. A control arrangement including a cupshaped structure, a diaphragm means mounted in one end portion of the cup-shaped structure, a control means mounted in the other end portion of the cup-shaped structure, said diaphragm means being operatively connected to said control means, a set of two toggle members each having their inner end portions pivotally connected to said actuating means, the opposite wall portions of said cup-shaped structure being provided with pivotal supports for pivotally supporting the outer ends of said toggle members, said cupshaped structure being resilient to apply a resilient column loading upon the toggle members.

6. A control arrangement including a support means, a control means and an actuating means connected together and mounted upon the support means, an adjusting means operating upon said actuating means for adjusting the relationship between the force of the actuating means and the operation of the control means, a rotatable knob for operating said adjusting means, and a mounting means provided with a rotatable mounting for supporting said supporting means upon an axis coaxial with the axis of said rotatable knob.

7. A control arrangement including a support means, a control means and an actuating means connected to ether and mounted upon the support means, an ad usting means operating upon said actuating means for ad usting the relationship between the force of the actuating means and the operation of the control means, a rotatable knob for operating said adjusting means, a mounting means provided with a rotatable mounting for supporting said support means upon an axis coaxial with the axis of said rotatable knob, and releasable means for releasably locking the support means relative to the mounting means.

8. A control arrangement including a cupshaped structure, a diaphragm means mounted in one end portion of the cup-shaped structure, a control means mounted in the other end p tion of the cup-shaped structure, said diaphragm -n1eans being operatively connected to said control means'a set of two toggle members each having their inner end portions pivotally. connected to said actuating means, the opposite. wall portions of said cup-shaped structure being provided with pivotal supports for pivotally supporting the outer endsof said toggle members, one of said toggle members being resilient to provide a resilient column loading.

"9. A. control arrangement including a support means, acontrol means and an actuating means connected together and mounted upon the support means, an adjusting means operating upon saidactuating means for adjusting the relationship between the force of the actuating means and the operation of the control means, a rotatable knob for operating said adjusting means, a mounting means provided with a rotatable mounting for supporting said support means upon .an axis coaxial with the axis of said rotatable knob, said actuating means being in the form of a flexible.diaphragm means having a coaxially arranged tubing connected thereto and extending therefrom, said adjusting means and said knob having a coaxially located aperture through which extends the tubing.

10. A control arrangement including a support means, an actuating means mounted in one portion of the support means, a control means mounted upon another portion of the support means operatively connected to the actuating means, a set of toggle members having their inner ends pivotally connected to the actuating means, a distortable resilient ring-shaped member pivotally connected to the outer ends of said toggle members to cause the control means to be operated with a snap action, said ring-shaped member being supported by the support means.

11. A control arrangement including a support means, an actuating means mounted in one portion of the support means, a control means mounted upon another portion of the support means operatively connected to the actuating means, a set of toggle members having their inner ends pivotally connected to the actuating means, a distortable resilient ring-shaped member pivotally connected to the outer ends of said toggle members to cause the control means to be operated with a snap action, and means for adjusting the location of the ring-shaped member relative to the support means.

12. A control arrangement including a support means, an actuating means mounted in one portion of the support means, a control means mounted upon another portion of the support means operatively connected to the actuating means, a set of toggle members having their inner ends pivotally connected to the actuating means, said support means including a distortable resilient cylindrical-shaped portion, the outer ends of said toggle members being pivotally connected to said cylindrical-shaped portion to cause the control means to be operated with a snap action.

13. A control arrangement including a support means, an actuating means mounted in one por tion of the support means, a control means mounted upon another portion of the support means operatively connected to the actuating means, a set of toggle members having their inner ends pivotally connected to the actuating means, said support means being in the form of a housing structure enclosing said actuating means and said control means and said toggle members, the

' outer ends of said toggle members being pivotally connected to said housing structure, said housing structure having resilient distortable portions adjacent the pivotal connection with said toggle members.

14. A control arrangement including a support means, an actuating means mounted in one portion of the support means, a control means mounted upon another portion of the support means operatively connected to the actuatin means, a set of toggle members having their inner ends pivotally connected to the actuating means, said support means being in the form of a housing structure enclosing said actuating means and said control means and said toggle members, the outer ends of said toggle members being pivotally connected to said housing structure, said toggle members being resilient.

15. A control arrangement including a support means, an actuating means mounted in one portion' of the support means, a control means mounted upon another portion of the support means operatively connected to the actuating 5 means and said control means and said toggle members, the outer end of one of said toggle members being pivotally connected to said housing structure, a wall portionof said housing structure being provided with a notch pivotally 10 receiving the outer end of another of said toggle members.

JAMES W. JACOBS.

REFERENCES CITED 15 The following references are of record in the file of this patent:

UNITED STATES PATENT a Number Name 20 1,861,046 Bower May 31, 1932 2,096,709 Dunn Oct. 26, 1937 2,493,323 Simson Jan. 3, 1950 

